Wechselwirkungen zwischen Eis und Ozean im Weddellmeer: Studien mit einem gekoppelten Eis-Ozean-Modell des Südpolarmeeres
Quantitatively, a good agreement with observations is achieved. Investigations of sea ice-ocean interaction on the continental shelf in the southwestern Weddell Sea feature a strong correlation between fluctuations of atmospheric forcing and the variability of sea ice formation. Anomalies of meridio...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | German |
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Universität Bremen
2000
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Online Access: | https://media.suub.uni-bremen.de/handle/elib/1779 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000000640 |
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/1779 2023-05-15T13:41:01+02:00 Wechselwirkungen zwischen Eis und Ozean im Weddellmeer: Studien mit einem gekoppelten Eis-Ozean-Modell des Südpolarmeeres Ice-ocean interaction in the Weddell Sea: A numerical study using a coupled ice-ocean model of the Southern Ocean Timmermann, Ralph Olbers, Dirk Beckmann, Aike Lemke, Peter 2000-06-09 application/pdf https://media.suub.uni-bremen.de/handle/elib/1779 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000000640 ger ger Universität Bremen FB1 Physik/Elektrotechnik https://media.suub.uni-bremen.de/handle/elib/1779 urn:nbn:de:gbv:46-diss000000640 info:eu-repo/semantics/openAccess sea ice-ocean interaction ice shelf-ocean interaction Antarctic Circumpolar Wave interannual variability Maud Rise deep convection Weddell Gyre structure 29 ddc:29 Dissertation doctoralThesis 2000 ftsubbremen 2022-11-09T07:09:40Z Quantitatively, a good agreement with observations is achieved. Investigations of sea ice-ocean interaction on the continental shelf in the southwestern Weddell Sea feature a strong correlation between fluctuations of atmospheric forcing and the variability of sea ice formation. Anomalies of meridional wind stress in the inner Weddell Sea are consistent with the phase of the Antarctic Circumpolar Wave (ACW). Positive anomalies of northward wind stress cause an increase of sea ice export in the same and of sea ice formation in the following year leading to an increased production of High Salinity Shelf Water. Driven by a varying density distribution over the continental shelf, the circulation in the Filchner-Ronne ice shelf cavity fluctuates between two modes, each of which features a characteristic distribution of basal freezing and melting regions. Thus, signals of interannual atmospheric variability propagate into the deep ocean and the sub-ice shelf cavities. The simulated Weddell Gyre features a pronounced double cell structure which is caused by the topographic effects of Maud Rise and Astrid Ridge. Flow around and across these elevations causes anomalies of vertical heat flux which affect the sea ice distribution only locally. The spring polynya in the region of Maud Rise appears as a wind-induced phenomenon which is not affected by regional topography. Deep convection in this region may be caused by modifications of the surface fresh water balance and does not depend on the existence of Maud Rise. Doctoral or Postdoctoral Thesis Antarc* Antarctic Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Southern Ocean Weddell Sea Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Antarctic Astrid Ridge ENVELOPE(12.000,12.000,-68.000,-68.000) Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Southern Ocean The Antarctic Weddell Weddell Sea |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
German |
topic |
sea ice-ocean interaction ice shelf-ocean interaction Antarctic Circumpolar Wave interannual variability Maud Rise deep convection Weddell Gyre structure 29 ddc:29 |
spellingShingle |
sea ice-ocean interaction ice shelf-ocean interaction Antarctic Circumpolar Wave interannual variability Maud Rise deep convection Weddell Gyre structure 29 ddc:29 Timmermann, Ralph Wechselwirkungen zwischen Eis und Ozean im Weddellmeer: Studien mit einem gekoppelten Eis-Ozean-Modell des Südpolarmeeres |
topic_facet |
sea ice-ocean interaction ice shelf-ocean interaction Antarctic Circumpolar Wave interannual variability Maud Rise deep convection Weddell Gyre structure 29 ddc:29 |
description |
Quantitatively, a good agreement with observations is achieved. Investigations of sea ice-ocean interaction on the continental shelf in the southwestern Weddell Sea feature a strong correlation between fluctuations of atmospheric forcing and the variability of sea ice formation. Anomalies of meridional wind stress in the inner Weddell Sea are consistent with the phase of the Antarctic Circumpolar Wave (ACW). Positive anomalies of northward wind stress cause an increase of sea ice export in the same and of sea ice formation in the following year leading to an increased production of High Salinity Shelf Water. Driven by a varying density distribution over the continental shelf, the circulation in the Filchner-Ronne ice shelf cavity fluctuates between two modes, each of which features a characteristic distribution of basal freezing and melting regions. Thus, signals of interannual atmospheric variability propagate into the deep ocean and the sub-ice shelf cavities. The simulated Weddell Gyre features a pronounced double cell structure which is caused by the topographic effects of Maud Rise and Astrid Ridge. Flow around and across these elevations causes anomalies of vertical heat flux which affect the sea ice distribution only locally. The spring polynya in the region of Maud Rise appears as a wind-induced phenomenon which is not affected by regional topography. Deep convection in this region may be caused by modifications of the surface fresh water balance and does not depend on the existence of Maud Rise. |
author2 |
Olbers, Dirk Beckmann, Aike Lemke, Peter |
format |
Doctoral or Postdoctoral Thesis |
author |
Timmermann, Ralph |
author_facet |
Timmermann, Ralph |
author_sort |
Timmermann, Ralph |
title |
Wechselwirkungen zwischen Eis und Ozean im Weddellmeer: Studien mit einem gekoppelten Eis-Ozean-Modell des Südpolarmeeres |
title_short |
Wechselwirkungen zwischen Eis und Ozean im Weddellmeer: Studien mit einem gekoppelten Eis-Ozean-Modell des Südpolarmeeres |
title_full |
Wechselwirkungen zwischen Eis und Ozean im Weddellmeer: Studien mit einem gekoppelten Eis-Ozean-Modell des Südpolarmeeres |
title_fullStr |
Wechselwirkungen zwischen Eis und Ozean im Weddellmeer: Studien mit einem gekoppelten Eis-Ozean-Modell des Südpolarmeeres |
title_full_unstemmed |
Wechselwirkungen zwischen Eis und Ozean im Weddellmeer: Studien mit einem gekoppelten Eis-Ozean-Modell des Südpolarmeeres |
title_sort |
wechselwirkungen zwischen eis und ozean im weddellmeer: studien mit einem gekoppelten eis-ozean-modell des südpolarmeeres |
publisher |
Universität Bremen |
publishDate |
2000 |
url |
https://media.suub.uni-bremen.de/handle/elib/1779 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000000640 |
long_lat |
ENVELOPE(12.000,12.000,-68.000,-68.000) ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Antarctic Astrid Ridge Maud Rise Ronne Ice Shelf Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Astrid Ridge Maud Rise Ronne Ice Shelf Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Southern Ocean Weddell Sea |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/1779 urn:nbn:de:gbv:46-diss000000640 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766144572799320064 |